21202240332 has 48 divisors (see below), whose sum is σ = 60888488192. Its totient is φ = 5591799360.

The previous prime is 21202240321. The next prime is 21202240337. The reversal of 21202240332 is 23304220212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21202240299 and 21202240308.

It is not an unprimeable number, because it can be changed into a prime (21202240337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9706894 + ... + 9709077.

Almost surely, 2^21202240332 is an apocalyptic number.

It is an amenable number.

21202240332 is an abundant number, since it is smaller than the sum of its proper divisors (39686247860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21202240332 is a wasteful number, since it uses less digits than its factorization.

21202240332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19415998 (or 19415996 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21202240332 its reverse (23304220212), we get a palindrome (44506460544).

The spelling of 21202240332 in words is "twenty-one billion, two hundred two million, two hundred forty thousand, three hundred thirty-two".